Free Human Body and Health MCQs with Answers

301. The color of blood is red due to __________?

• A. Haemoglobin
• B. Neutrophils
• C. Esinophils
• D. Hematocrit

Explanation: Haemoglobin is the iron-containing pigment in red blood cells that gives blood its red colour and carries oxygen. Neutrophils and eosinophils are white blood cells, while haematocrit is a measure of packed red-cell volume.

302. Short sightedness is due to__________?

• A. Shifting of the iris
• B. Elongation of eyeballs
• C. Weakening of the retina
• D. Weaker muscles

Explanation: In short-sightedness, or myopia, the eyeball is usually too long or the cornea is too strongly curved, so images form in front of the retina. A concave lens moves the focus back onto the retina.

303. Animal without red blood cells is_________ ?

• A. Frog
• B. Earthworm
• C. Snake
• D. Crocodile

Explanation: Earthworms do not have red blood cells; their haemoglobin is dissolved directly in the blood plasma. Vertebrates such as frogs, snakes and crocodiles possess red blood cells, although those cells retain nuclei in these animals.

304. vitamin D is chemically know as_________ ?

• A. Retinol
• B. Calciferol
• C. Tocopherol
• D. None of these.Standardized & Admissions Tests

Explanation: Vitamin D is collectively called calciferol, including forms such as D2 and D3. Retinol is vitamin A, tocopherol is vitamin E, and vitamin K is a different fat-soluble vitamin.

305. Corona disease is a ________ disease?

• A. Infectious diseases
• B. Deficiency disease
• C. Hereditary disease
• D. Physiological diseases

Explanation: COVID-19, caused by the coronavirus SARS-CoV-2, is an infectious disease because it spreads through transmission of a pathogen between hosts. It is not a deficiency, hereditary, or merely physiological disease.

306. The human eye forms the image of an object at its________?

• A. Cornea
• B. Pupil
• C. Iris
• D. Retina

Explanation: The retina is the light-sensitive layer at the back of the eye where the lens forms a focused image. The cornea and lens help focus light, while the pupil is an opening controlled by the iris.

307. Diabetes could be classified into______ types.

• A. Two types
• B. Three types
• C. Four types
• D. None of these

Explanation: Basic medical classification commonly identifies type 1 diabetes, type 2 diabetes, and gestational diabetes. Other specific forms exist, but these are the three major categories expected in elementary MCQs.

308. Which of the following is caused by bacteria?

• A. Malaria
• B. Tetanus
• C. Cancer
• D. None of these

Explanation: Tetanus is caused by the bacterium Clostridium tetani, whose toxin affects the nervous system. Malaria is caused by a Plasmodium parasite transmitted by mosquitoes, not by bacteria.

309. Which component of diet helps in preventing constipation ?

• A. Proteins
• B. Fats
• C. Fiber
• D. Carbohydrates

Explanation: Dietary fiber adds bulk and retains water in the stool, helping it pass through the intestine more easily. Low fiber intake is therefore a common contributor to constipation.

310. The size of Covid-19 virus is______?

• A. 25-30KB
• B. 28-30KB
• C. 29-30KB
• D. None of these

Explanation: The SARS-CoV-2 genome is about 30 kilobases long, approximately 29.9 kb. Kilobases describe the length of its genetic material, not the physical diameter of the virus particle.